Fire arch with air-intake ports



June 1 1926.

C. A. STRACHOTA FIRE ARCI'LWI'IH AIR INTAKE PORTS Filed Feb. 5 1923 4 Sheets-Shqet 2 @JZWI M Patented June l, 1926.

-UNITED STATES PATENT OFFICE.

CLARENCE A. STRAGHOTA, O]? MINNEAPOLIS, MINNESOTA, ASSIGNOIR 'Ji0 LIITAK EIBE BRICK ARGE (10., OF MIIN'NEAIOLIS, MIIN'NESOTA, A. CORIPORATION OF MINNESO'I'A.

EIBE ARGE WITH AIIR-INTAKE SPORTS.

Application filed February 3, 19231 Serial N0. 616,714.

My invention relates to furnaces such as used in connection with boilers and which include fire arches made up of blocks or tiles suspended from overhead beams; and

the invention provides a highly efficient scheme for the introduction of air into the furnace through air intake passages Provided in the fire arch.

Generally stated, the invention consists of the novel construction, arrangement and combinations of Parts hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like oharacters indi- 1li cate like parts throughout the several views.

Rieferring to the drawings: v

Fig. 1 is a perspective showing a Portion ofa furnace and a portin of a fire arch, the latter having my .invention incorporated therein;

Fig. 2 is a diagrzimmatic lan view illustrating the arrangement of air intake valves 011 the top ofthe furnace arch;

Fig. 3 is a transverse vertioal section on 2 the line 3-3 of F ig'. l, Some arts. being broken away;

Fig. 4 is a longitudinal section 011 the line 4-4 of Fig. 3,- some parts being broken away;

Fig. 5 is a perspective showing one of the upper port-equipped blocks of the arch;

Fig. 6 is a view corresponding to Fig. 4, but illustrating a slightly modified arrangement;

Fig. 7 is a view corresponding to F ig. 5, but illustrating a slightly modified form of the port-equ1pped block;

Fig. 8 is a fragmentary vertical longitudinal section of the furnace and arch, illustrating a modified arrangement;

Fig. 9 is a view corresponding to Fig. 3, but illustrating a still fu'rther modified arrangment;

F1g. 10 is a vertical sect1on taken from 4 front to reax throu h the inner end of the fi1e arch, showing a%so a portion of an apron Wall, and illustrating an arrangement of air intake orts for the introduction of air into the urnace through the upwardly 150 curved inner end of the arch; and

Fig. 11 is a fra entary section taken from front toward t e rea1 through the. furfirst to the construction illus-- by hanger brackets 17. The arch beams 16 support a double" susponsion arch made up chiefly of slidably interlocked upper arch blocks 18 und lower arch blocks 19, but also including rounded end blocks 20. The arch here illustrated may be assumed to be wh at is weil known to the trade as the Liptak double suspension arch. In an arch of this type, the upper blocks 18 have flanges that slide upon the flanges of the beams 16 and the lower or underfacing blocks 18 have redmced necks With flanges that slide up0n lower flanges of the upper arch blocks. However, my inven'tion is not limited to this particular type of arch nor to the particular way of suspending the arch-f0rming blocks.

The first illustration of the invention is in connection with this type of arch and is preferably carried but as follows:

Certain of the upper blocks 18 are formed with large vertical ports or air passages 21 that open into or through a horizontal channel 22 that is formed between the lower portions of the upper blocks 18 and the upper portions of the lowier blocks 19. Certain oft the lower blocks 19 am also provided with air ports and passages 23 which may be located in vertica l alignment with the ports 21, as best shown in Fig. 4, or may be oflset longitudinally, as shown in Fig. 6. In any event, the ports 23, which deliver the air directly into the top of the furnace, am dis tTibuted over the sur'face of the arch so as to give a uniform accelerated combustion by the introduction of hot air into the furnacg through said p0rts.

It will be desirable to vary the amountofair that will be drawn into the'- furnace through these air intake portsand thismay be madily accomplished by the use of slide valves 01 gates 24,- (see particularlyFiga i j 2, 3, 4 am]. )mounte d to slide in grooves in the tops of the upper blocks which have the grooves 21. As shown, these valves move under retaining bars 25 bolted to said blocks, (See particularly Fig. 5). One transverse row of valves 24 is connected by sl1ort' links 26 and the other row by long links 27, to o1ank arms 28 of 10ck shafts 29 mounted in suitable fixed bearings 30. The valves 24 just described are in the form of cast metal plates, while the valve 31 shown in Fig. 7 is a refractory block having a cast lug bracket 32 secured thereon and.to which the adjusting link may be pivoted.

Figs. 8 and 9 are sort of diagrammatic sections in which the blocks of the main fir'e arch are not individually shown and in Which, furthermore, such arch rfiight be of monolithic construction but formed with a longitudinal air channel 33 and with ofl:'set upper and lower air intake ports 34 and 35. In the arrangement illustrated in Fig. 8, the air channel 33 is connected to the delivery end of an air supply pipe 36 that may be assumed to lead from a fan or blower, not shown. Also in this arrangement, Fig. 8, the ports 34 are arranged to be opened and closed by valves 37 that correspond to the valves 24 previously described.

In the construction illustrated in Fig. 9, the ports 34 arte connected to branch air pipes 38 that lead from a main air supply pipe 39, which, in turn, will be assumed t0 lead from a fan or blower, not shown. The brauch pipes 38 are shown as provided with dampers 40, by means of which they may be opened more or less so as to distribute the an properly to the several ports. With the arran ements illustrated in Figs. 8 and 9, air wi be fecl into the furnace under pressure through the fire arch and will insure more complete combustion of the smoke. Also with the arrangements previously described, the additional supply of air through the fire ar :h will insure complete combustion. Obviously, the fire aroh will be at l1igh temperature, so that the air drawn in 01 forced in through the same will be preheated and delivered to the flames under high temperature, which is necessary to insure the desired complete combustion and abatement of the smoke n.uisance, as well as economy in the use of fuel.

In F1 10, the main fire arch is shown as provide with an upwardly curved inner ortion made up of wedge-shaped upper' and ower blocks 18 and 19, whioh, except for the wedge shape noted, are of the same form and arrangement as the blocks 18 and 19, the inner ends of the arch beams being upward- 1y curved to properly support the said upper blocks 18". The numeral 41 indicates an apron wall supported above the upturned end of the main arch but which constitutes no part of the present invention and, hence, may not be further considered. lt should,

howevei, be noted that in this arrangement the air .channel 22 between the upper and lower blocks has an upwardly curved extension 22 that leads to ports 42 formed in 0r by the omission of certain of the blocks 19. In said arrangement, Fig. 10, certain of the upper blocks 18 are provided with the upper orts 21 and are equipped with valves 24, as in the construction illustrated in Figs. 1 to 5, inclusive. v

In the construction illustrated in Fig. 11, an enlarged ignition arch 43 is supported below the outer end of the main arch by brackets 44 hung from beams 45, and a eurtain wall 46 is snpported by said brackets and extends from the ignition arch to the main arch. This construction need not here be further considered, except to note that certain of the blocks of the Curtain Wall 46 are formed with air intake ports 47 that are connected to an air trunk 48 in which is maintained air linder pressure through a supply pipe 49 that leads from a fan or blower. Also, the air trank 48 is shown as provided with auxiliary air intake orts 50.

What I claim is:

l. A double suspension arch comprising supporting beams, upper and lower archforming blocks hung therefrom with a longitudinal air assage between the said upper and lower blocks, said upper and lower blocks having air intake orts in communication with said longitudmal air assage;

2. A double suspension arch comprising supporting beams, upper and lower archforming blooks hung therefrom with a lon gitudinal air assage between the said upper and lower block-s, said upper and lower bloks having air intake ports in c0mmunication with said longitudinal air assage, the air orts in said uppe r and lower blocks being horizontally offset.

3. A double suspension arch coniprising supporting beams, upper and lower archforming blocks hung therefrom with a longitudinal air assage between the said upper and lower b ocks, said upper and lower blocks having air intake orts in communication with said longitu 'nal air assage, the said arch having an inwardly and upwardly extended Portion and oertain of the orts of said lower blocks being located in the said upwardly and inwardly extended portions'.

4. A double suspension arch comprising supporting beams, up er and lower archforming b ocks hung t erefrom with a longitudinal air passage between the said upper' and lower blocks, said upper and lower blocks having air intake ports in communication with said longitudinal air assage, and valves cooperating with the orts of the upper blocks.

5. A double suspension arch comprising supporting beams, upper and lower archforming blocks hng therefrom with a lonports of said lower bloc:cs bein located in gitudinal air passagebetween the said upper the said upwardly and inwardly= extended and lower blocks, said upper and lower portions, and valves cooperating with the 1 blocks having air intake ports in communiports of the upper blocks.

l cation with said longitudinal air 'passage, In t'estimony whereof I aifix my signature.

the said arch having an inwardly and u wardly extended porti0n und certain 0f t e CLARENE A. STRACHOTA. 

